windows - Batch ERRORLEVEL ping response

Question

I'm trying to use a batch file to confirm a network connection using ping. I want to do batch run and then print if the ping was successful or not. The problem is that it always displays 'failure' when run as a batch. Here is the code:

@echo off
cls
ping racer | find "Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),"
if not errorlevel 1 set error=success
if errorlevel 1 set error=failure
cls
echo Result: %error%
pause

'racer' is the name of my computer. I'm having my computer ping itself so I can eliminate the variable of a poor connection. As I said before, the batch always results in failure. Oddly enough, the program works fine if I copy the code into the command prompt. Does anyone know why the program works fine in the command prompt but doesn't work as a batch? Thanks

Answer 1

A more reliable ping error checking method:

@echo off
set "host=192.168.1.1"

ping -n 1 "%host%" | findstr /r /c:"[0-9] *ms"

if %errorlevel% == 0 (
    echo Success.
) else (
    echo FAILURE.
)

This works by checking whether a string such as 69 ms or 314ms is printed by ping.

(Translated versions of Windows may print 42 ms (with the space), hence we check for that.)

Reason:

Other proposals, such as matching time= or TTL are not as reliable, because pinging IPv6 addresses doesn't show TTL (at least not on my Windows 7 machine) and translated versions of Windows may show a translated version of the string time=. Also, not only may time= be translated, but sometimes it may be time< rather than time=, as in the case of time<1ms.